/Engine/Source/Runtime/Engine/Public/MaterialCompiler.h
int32 StrataHairBSDF ( int32 BaseColor, int32 Scatter, int32 Specular, int32 Roughness, int32 Backlit, int32 EmissiveColor, int32 Tangent, const [FString](API\Runtime\Core\Containers\FString) & SharedLocalBasisIndexMacro, [FStrataOperator](API\Runtime\Engine\Rendering\FStrataOperator) * PromoteToOperator )